Textile bobbin



1942 L. c. HOSFIELD 0 TEXTILE BOBBIN Filed Sept. 13, 1939 illlll.

- INVENTOR LEE CHOSF'IELD ATTORNEY Patented Dec. 1 5, 1942 UNITED STATES PAT ENT OFFICE TEXTILE BOBBIN Lee C. Hosfield, Pal-ma, Ohio, assignor to Carbide and Carbon'Chemicals Corporation, a corporation of New York Application September 13, 1939, Serial No. 294,607 '1 Claim. (Cl. 242-124) them to be rotated about their axes, the complete bobbins being constructed in one piece or consisting of an assembly of several parts.

Where the bobbin is an integral unit, repairs to damaged or worn parts, particularly bearing surfaces which are subject to' the greatest wear, are diflicult and relatively expensive. In the case of bobbins composed of an assembly .of many pieces, all designs heretofore have been such that disassembling the bobbin and repairing the damagedparts have necessitated rather tedious work. with any type of construction, however, the greatest difiiculty has been to design a bobbin which can be manufactured at low cost, whichcan be repaired easily. and in which worn partscan be readily replaced while at thesame time maintaining, or quickly obtaining, the concentricity orex-act centering of the bobbin with relation to its bearings.

n. object of the invention is to provide a bobbin so constructed that it can be manufactured at relatively low cost and can be assembled or disassembled readily without injury to its parts, and without'loss of concentricity, when parts are interchanged for repair or other reasons. Another object is to provide a bobbin having parts of dissimilar materials and a simple construction permitting low cost for its maintenance in good repair.

These and other objects will be evident from the following description, having reference to the annexed drawing, in which Fig. 1 represents a side view, partly cut away,

of a typical bobbin made in accordance with the 4 of the bobbin shown in which serve to keep the yarn confined to the bobbin. In the center of'each of the heads ll 55 'and i2 is a hole into which are inserted clamp nuts [3 and H. The clamp nut i3 has a shoulder It. at one end which engages the head II and urges it against the barrel i0, and the clamp nut l4 likewise has a shoulder I6 which engages the head I! and urges it against the barrel I0.

Through the centers of the clamp nuts l3 and 14 pass holes i1 and i8, respectively, each of which forms a bearing for the bobbin toward the shoulder end of the clamp nuts l3 and I, respectively. The opposite ends of the holes l1 and I! may be threaded or otherwise adapted adjustably to engage a tie rod 18. Mounted on the clamp nuts i3 and i4 inwardly of the heads II and I2, respectively, are centering discs 20 and 2| which fit frictionally within the barrel l0 adjacent to each of its ends and hold it in concentric alignment with the holes I! and I8. In other words, the centering discs 20 and 2|, which are removable and replaceable through the ends of the barrel, servethe purpose of centering the barrel Ill with respect to the axis of rotation. In addition, the centering discs 20 and 2| increase the strength of the barrel in on each end to aid in preventing distortion or collapse thereof when the barrel i0 is subjected to the extreme pressures incident to tight winding of the yarn. The entire assembly is held together by the tie rod l9 which is threaded at both ends or otherwise adapted to engage the clamp nuts 13 and I4.

The barrel it) may be constructed of any suitable material, such as metal, glass, artificial resin and the like, or it may be a combination of a metal covered with a non-metallic material.

' However, it has been found that a phenolfor bobbin barrels which come in contact with corrosive liquids, inasmuch as this resin is not attacked by, nor does it warp or swell appreciably in, the various solutions employed in the processing of artificial textile yarns. It is additionally lightweight, relatively inexpensive and hasa surface of a texture which is non-injurious to the yarn. In particular, it has been found that barrels made of a phenol-formaldehyde resin bonded with a base of paper, canvas or linen are particularly adapted for use in the bobbins of this invention. The long life of this material without distortion or change in size insures that the bobbin will be true-running throughout its useful life. I

Although it is not essential, it is preferable to design the centering discs 20 and 2| slightly greater in diameter than the inside diameter of the barrel 0, and to increase the inside diameter of the latter at the ends sufliciently to accommodate snugly the centering discs 20 and 2|, as shown in the drawing. This prevents the discs 20 and 2| fromworking toward the center of the bobbin, and thus failing to engage the clamp nuts I3 and It. If desired, the ends of the bar rel It] may be'tapered on the inside to accommodate tapered centering discs, but this requires such close machining of the parts involved in order to secure a snug or firm fit without permitting a space between the heads H and i2 and the barrel it wide enough'for the yarn to slip into, that itis inferior to the design shown in the drawing.

The heads ii and i2 alsomay be constructed of many materials, but due to the fact that they must take up the pull of the clamp nuts l3 and M, they are generally made of metal, and for use in bobbins coming in contact with the usual fiuids used in the processing of artificial textiles, the heads H and l2 are preferablymade of a corrosion-resistant alloy, such as the so-called stainless steels. If non-metallic heads H and i2 are desired, very satisfactory ones may be made from the same phenol-formaldehyde resins bonded with a base of paper,'canvas or linen, as is preferred for the construction of the barrel ill.

Since the clamp nuts l3 and M, and the centering discs 2|! and 2| must not suffer appreciable change in their dimensions over long periods of use, they should be made of a material which fied and fabrication costs reduced by making the centering discsintegral parts of the clamp nuts. A bobbinof this construction isillustrated in Figs. 3, 4 and 5, wherein a thin-"walled cylindrical barrel 3|] is held between two heads 3| and 32, which have fiat inside surfaces substantially flush with and in contact with the 'end surfaces of the barrel. In the center of each of the heads v 3| and 32 isa hole of the same size as the inside diameter of the ends of thebarrel 30. Into these holes are inserted clamp nuts 33 and 34 which 7 R have surfaces machined to fit snugly by friction in the ends of the barrel 30, whereby such machined surfaces function as the equivalent of the centering discs 20, 2|, and eliminate the necessity site ends of the holes 31 and 38 may be threaded or otherwise adapted adjustably to engage a tie rod39 which passes through the barrel in spaced relation to its inside wall. The tie rod 33 is of tubular construction having a passage therethrough in continuation of the passages 31 and 38 to permit spindle mountingon a vertical axis, in which case only one bearing may be employed and the spindle extends through the entire length of the bobbin. This arrangement frequently is used in textile filament twisting and throwing operations. The clamp nut 33 may be provided with a slot 33 (Fig. to permit positive engagement with a live center havin a corresponding ridge or key on the driven pin. It is essential that the joint between the heads 3i and 32 and the ends of the barrel 33 be uniformly tight in order to prevent filaments of the yarn from being caught between these pieces during winding. Although satisfactory joints may be made by carefully machining. the ends of the barrel 33 to fit snugly'against the heads 3| and 32, it is quite often, more satisfactory from the practical standpoint to feather the ends of the barrel 33 (taper d6 of Figs. 3 and 5), or taper the ends on the inside of the barrel 33 to provide substantially line contact with the heads 3| and Fig. 1.

. small diameter the construction may be simpli-.

of employingcentering discs separate from the.

clamp nuts. Each of the clamp nuts'33 and 34 has a shoulder 35 and 36, respectively. The

directly in. line with the contacting surfaces of the heads and the barrel and urge them' directly against the ends of the barrel 30, whereby the I heads 3| and 32. are subjectedonly to compressive stress. I This makes-possible the use of materials flow in tensile and shear strengths for shoulders 35 and 36 engage portions of the out- 6 side surfaces of the heads 3| and '32, respectively,

construction of the heads 3| and 32. In partic-' in the hole.

32, so that the lessened contact surface between the ends of the barrel 33 and the heads-3| and,

32 permits greater pressures and uniform contact to be obtained without developing excessive stresses in the other parts of the bobbin. This construction of the ends of the barrel 36, shown in detail in Fig. 5, is equally applicable to'bobbins having larger barrels and centering discs, such as taper 22 at the ends of barrel iii in It will be evident that a number of modifications in the construction of the bobbin may be made without departing from the invention. For instance, it may be desirable for some uses to elongate the clamp nuts i3 and M and adapt them to engage each other in the center of the bobbin, thus obviating the need for the separate tie rod I9, and the shoulders i5 and it of clamp hexagonal shape is preferred to facilitate the as-- sembly and disassembly of the bobbin without special tools. Where the bobbin is constructed according to Figs. 3 and 4, the clamp nuts 33 andv 34 may even have round shoulders, as shown,

since adequate tightening of the assembled parts can be accomplished by turning the heads 3| and 32 by hand. Although the tie rod IQis shown clamp nut l3 (or, in Fig. 3, the head 3| and the clamp nut 33) are fabricated as a unit, most of the advantages of the construction described are lost, inasmuch as one ofthe main features of this construction is the ready and economical replacement of the bearings of the bobbin. .In'

either bobbin design (Figs. 1 or 3), the bearings provided by the clamp nuts may be used on live centers where the bobbin to be driven by atorque applied at its bearings, simply by mounting the bobbin upon pins, at least one of which is live, or driven, and tapered slightly so as to grip frictionally the clamp nut when inserted both pins rotate with the bobbin, as the actual pivoting takes place within the bearings of the Of course, in standard practice,

- provide a slot or groove in the clamp nut into which a corresponding key or ridge on the driven pin may slide, as is shown in Figs. 3 and 4. However, for some uses it is desirable to mount the bobbin on dead centers or free running pins, and to obtain rotation by.contact of the barrel (or yarn cake built upon the barrel) with a. driving roller in order to secure constant peripheral speed.

Manymodifications of the invention, both as to construction and as to the materials.used, will be apparent to those skilled in the art, and the invention should not be limited other than as defined by the appended claim.

I claim A bobbin comprising, in combination, a cylindrical barrel having internally tapered ends; a

head at each end of said barrel having a flat surface engaging the tapered ends of said barrel in substantially line contact; a tie member within said barrel; a clamp means at each end of said barrel bearing against the outside surface of the corresponding head, engaging said tie member, and having a passage therein adapted to provide a bearing for said bobbin; and a disc at each end of said barrel, separate from said heads, frictionally fitting within said'ban'el for centering said barrel and said heads with respect to the axis of rotation of the bobbin.

, LEE C. HOSFIEID. 

